some armv7 decode helpers are trivial functions but didn't inline

both from_u8 and the build function here compiled to truly trivial code:
four instructions (mov rdi, rax; cmp 0xlim, rax; jae panic; ret) in the
hot path, and constrained register choice on the caller side. inlining
these makes for a *smaller* armv7 decoder, on the order of 5kb down from
5.5kb. in the process it also gets about 45% faster (400mb/s to 560mb/s)

inlining decode_into, then, really just helps the standalone decoder
benchmark case. this moves decode throughput from 560mb/s to 724mb/s.

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